Since I don't have anything new to add I'll be posting some old build photos for everybody's entertainment. Here's a shot of the tub removed from the rotating frame showing the rotary slip ring that transfers the power up to the machinery deck. Notice the 135# marking. That was the weight of the rotating frame less walking cams.
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Here's another old picture of the revolving frame....
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This one should have been in the earlier post on the swing gear box that shows me fitting the box for proper gear alignment on the deck.
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